Population structure and evolutional history in the freshwater crabs Potamon ruttneri (Crustacean: Brachyuran: Potamidae)

Publish Year: 1397
نوع سند: مقاله کنفرانسی
زبان: English
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BIOCONF20_139

تاریخ نمایه سازی: 28 اردیبهشت 1398

Abstract:

True freshwater crabs spend their whole life cycle in freshwater environments, lack of larval period and direct development. They are highly phylopatric and have limited dispersal capability. Therefore, they count as a suitable model for biogeographically studies. Potamon ruttneri Pretzmann, 1962 is distributed from northeasternIran to northwestern Afghanistan. Populations of this species occupying two basins: Qara-e-Qom and the Central desert in northeastern Iran. The aim of this study was to investigate the genetic structure, demography, and relationships of this species population in northeastern Iran. Seventy specimens were collected from ten sites in Khorasan province. A partial fragment of Cytochrome Oxidase subunit 1 (COI), was amplified by COL6 and COH16 primers. A haplotype network was designed in order to show intraspecific variability. We used analysis of molecular variance (AMOVA) to assess the genetic differentiation among populations of the two deranges basins and demographic history was inferred by mismatch distribution analysis in the Arlequin ver 3.5. Tajima’s D-test and Fu’s Fs-test were applied to test deviations from neutral molecular evolution. The results indicate that there are three haplotype groups with highly low haplotype and nucleotide diversity and insignificant genetic differentiation which showed existences of gene flow among the populations of P. ruttneri. In addition, non- significant and positive value for Neutrality tests and also according to the distribution of mismatches and topology of the haplotype network rejected the neutral hypothesis evolution and recent expansion indicating that populations have remained constant over the past history and have not been expanded. The low genetic diversity in the population of P.ruttneri is a possibility to be influenced by environmental conditions within distribution ranges.

Authors

Farahnaz Sheibak

Department of Biology, Faculty of Basic Sciences, University of Hakim Sabzevari, Sabzevar, Iran

Alireza Keikhosravi

Department of Biology, Faculty of Basic Sciences, University of Hakim Sabzevari, Sabzevar, Iran

Reza Naderloo

Department Biology, Faculty of Basic Sciences, University of Tehran, Tehran, Iran